bragdon



einen @smi 'ZEBINA L. BRAGDON,

or BANGOR, MANn.

Letters Patent No. 101,575, Alated April 5, 1870.

IMPROVED SEWER-GRATE The Schedule referred to in thele Letters Patent and making part of the same.

To all who/m it may concern.- u

Be it known that I, ZnBINA L. BRAGDON, of Bangor, in the county of Penobscot and State of Maine, have invented a new and valuable Improvement in Sewer-Grate anddo hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings making a part of' this specicatiou, and to the letters and figures, of reference marked thereon.

Figure4 1 of the drawing is a representation of the outer frame of the grate.

Figure 2 is a view of cross-bar, showing the ends split before welding.

Figure 3 is a top view of the grate.

Figure 4 is a sectional view of the same.

' Myinvention relates to grates for t-he openings over street-sewers and It consists in constructing the cross-bars of such grates with an upward curve, and splitting and welding such bars to the frame in a new and useful manner.

A in the drawing represents the frame of a grate,

land

B, the cross-bars thereof, bent or curved upward, as shownvon iig. 2.

When the bars of the grate are thus curved, the

sewer is protected, toa great extent, from sticks, stones, and the like, and no large Iamount oi' matter can collect upon the bars, so as to` prevent a free passage of water therethrough.

In constructing these gratcs, I first form the frame, and then, after forming and curving the bars, I split them open at each end until jaws are formed of suiii# cient capacity to clasp the frame. I pass these jaws respectively over the frame while red hot, and weld them firmly thereto. This welding may also he effected when the iron is cold, but it is donc best and m-ost rapidly under a proper degreeof heat.

' This method of manufacture furnishes ready'means of supplying a broken or worn-out bar, and is in other respects an improvement over the ordinary method.

What I claim .as my invention, and desire to secure by Letters Patent, is-

lhe grate for sewers herein described, constructed with curved bars of wrought iron welded to the frame,

as specied. u

In testimony that I claim the above, I have hereunto subscribed my name in the presence of two witnesses. l y

" ZEBINA L. BRAGDON.

Witnesses:

y DANIEL SMITH, J r.,

JOSEPH RICHARDSON. 

